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Motorworld’s paper № 32

During the WWII the Moscow Motorcycle Plant was evacuated to Irbit where many different types of motorcycles were produced at the time, and the IMZ M-75 was one of them. This experimental model was made in a racing and a road versions, being a prototype of the serially manufactured M-72.

The IMZ M-75 was designed in 1943 and equipped with V-twin, OHV, 4-stroke engine with a maximum capacity of 35 hp at 5,100 rpm; it could reach the maximum speed of 170 km/h.

However, the engine was overheating very often, which made the two-bearing crankshaft to crack; also the flange would fail, with which the cylinder was affixed to the crankcase. Plant workers knew of these flaws and they were trying hard to fix them.

It is difficult to figure out today what may have been the goal for the IMZ designers in 1943. Maybe the need to create a more powerful machine for the military was their main idea during the war years, or they may have the second-tier ideas about the motorcycle’s possible use as a sports vehicle (please read the Aleksei Popov’s article «Sports Motorcycles Using the Horizontally-Opposed Layout» for more detail). Outside of its military use, the M-75 could have become, in the minds of its developers, a great civil machine. The OHV engine significantly widened the operational capabilities of the machine.

In the first post-war years, the work on improving this model was continued. The M-75 was prepared for its launch to serial production. According to the classification of that time, OHV machines were called sports vehicles, and their light-weight, boosted versions were intended for competitions and called racing bikes.

The road version of the M-75 didn’t go for mass production, so all that subsequent work was done for the purpose of its sports applications.

Over the whole period of production between 1943 and 1951 only 150 IMZ M-75 motorcycles were produced.


Manufacturer Irbit Motorcycle Plant, Irbit (USSR)
Years of manufacture 1943 – 1951
Quantity produced, units 150
Price
Today’s value
ENGINE AND TRANSMISSION
Type V-shape, twin-cylinder, OHV, 4-stroke type
Engine capacity, cc 746
Bore and stroke, mm 78 х 78
Engine rating 35 h.p. at 5100 rpm
Sparking Magneto M-90
Carburetor К-37 — 2 units
Batery 6 V
Clutch Double-plate, dry
Transmission 4-speed
FRAME AND WHEELBASE
Frame type Tubular, duplex, closed-type, welded
Front suspension Telescopic
Rear suspension Sprung
Brakes Drum type
Wheel size 3,75 х 19
DIMENSIONS
Length, mm
2 109
Width, mm
   727
Height, mm
   960
Wheelbase, mm
1 400
Ground clearance, mm
   135
Seat height, mm
   740
Mass, kg
   183
Gas tank size, l
     22
Maximum speed, km/h
   170
Range, km